Pilot stage for pressure control valves

Details Pilot stage for pressure control valves Pilot stage for pressure control valves

1994-07-28

1995-09-05

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137489, 137495, G05D 1610, F16K 1710

Patent

active

054471745

ABSTRACT:
A pilot stage for pressure control valves includes an axially displaceable valve piston which bounds a valve chamber axially on one side and includes a valve seat for a closure cone therein. Valve piston has an actuating surface in a pressure chamber that is substantially larger than the free cross section of the valve seat. By pressurization of this pressure chamber, a large hydrostatic force is exerted on the valve piston which opposes the closing force of the pressure-setting spring. A housing stop fixes a first axial end position of the valve piston in the direction of this hydrostatic force. The pilot control stage has improved properties for both manually adjustable pressure control valves and proportional pressure control valves.

REFERENCES:
patent: 2498542 (1950-02-01), Gardiner
patent: 3180355 (1965-04-01), Long
patent: 3884262 (1975-05-01), Assembergs
patent: 3972345 (1976-08-01), Court
patent: 4275758 (1981-06-01), Masuda
patent: 4351356 (1982-09-01), Koiwai et al.

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